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Wedge Flow Meter Manufacturers: Sourcing High-Viscosity Slurry Probes
Quick Answer: Wedge flow meters measure high-viscosity fluids and abrasive slurries with solid contents up to 60%. They work without moving parts or sharp edges that catch fibers. Silver Automation Instruments supplies remote-seal wedge probes in 316L or PTFE-lined bodies for mining, wastewater, and heavy oil applications. Send us your pipe size (DN), viscosity (cP), and solids percentage to get a specific price quote.
Why Wedge Meters Work Where Others Fail
Standard flow meters choke on thick, sticky media. Orifice plates erode under slurry impact. Magnetic flow meters lose signal when solids concentration exceeds 30%. Wedge meters solve this with a V-shaped restriction that self-scours. The wedge creates a differential pressure without a dead zone where particles settle.
We have supplied wedge probes to a nickel mine in Indonesia for 45% solids tailings. The previous magmeter failed every 8 weeks. The wedge probe is still online after 14 months with zero maintenance. Another customer in Vietnam uses a wedge meter on heavy fuel oil with viscosity up to 12,000 cP at 80°C. No heating jacket needed.
Key Specs to Ask a Manufacturer Before You Buy
Body material and lining. For abrasive slurries specify 316L stainless steel with Stellite-coated wedge. For chemical resistance choose PTFE-lined body. At a wastewater plant in the Philippines we supplied a PTFE-lined wedge probe after the customer’s carbon steel unit corroded in 6 months.
Viscosity range. A wedge meter handles from 5 cP up to 50,000 cP without special calibration. Above that, the Reynolds number correction becomes critical. Tell the manufacturer your exact centipoise range.
Solids content and particle size. Slurries with 50–60% solids need a wedge with a wide gap to prevent clogging. Ask for the minimum allowable beta ratio for your slurry type.
Remote seal vs. direct mount. Remote diaphragm seals prevent plugging when the process temperature exceeds 150°C or the slurry tends to solidify. Silver Instruments uses capillary-filled systems with silicone or NaK fill fluid depending on temperature.
Output and certification. 4-20 mA HART is standard. For hazardous areas request ATEX Zone 1 or IECEx. We also supply Modbus RTU for direct PLC integration.
Silver Automation Instruments’ Wedge Flow Probes
We fabricate wedge meters in our Nanjing workshop. Sizes run from DN15 up to DN600. Pressure ratings range from PN16 to PN420. The standard accuracy is ±1.0% of actual flow rate; with wet calibration on a viscosity-matched test rig we reach ±0.5%. Every probe leaves with a calibration certificate traceable to ISO 17025.
Our wedge meter portfolio includes four main configurations:
Fixed-wedge meter for dedicated process lines where flow range is stable. Replaceable wedge element for services where the wedge erodes over time. Integral PT100 RTD for mass flow calculation with a separate flow computer. Twin-wedge design for bidirectional flow in tank farm transfer lines.
Most engineers skip this part, but the capillary fill fluid matters. At a palm oil refinery in Malaysia
Real-World Installations We Have Seen
In practice, wedge meters appear in places where other flow meters have been tried and have failed. A coal preparation plant in Australia replaced four magnetic flow meters with wedge meters after magnetite slurry kept abrading the electrodes. The total installed cost was 40% lower because the wedge meters did not need grounding rings or periodic liner replacement.
Here is the thing: wedge meters need a straight pipe run. Our recommendation is 10D upstream and 5D downstream for fluids below 3,000 cP. For higher viscosity, the required straight run drops to 5D and 3D. That matters in crowded pump rooms.
In a sewage treatment plant in Colombia, wedge meters measure primary sludge at 5–8% solids. The operators had tried ultrasonic transit-time clamps, but the bubbles and solids killed the signal. The wedge probes were installed between two flanges and have run without recalibration for two years.
FAQ
Can a wedge meter handle fibrous material like paper stock? Yes. The V-shaped wedge shears fibers rather than snagging them. Install the meter with the wedge in the vertical plane to help solids pass. Silver Instruments supplies a polished wedge face for pulp and paper applications.
What is the typical price of a DN50 wedge flow meter? A 2-inch wedge probe with remote diaphragm seal and HART transmitter starts around AUD 2,800, depending on material and certification. Custom wet calibration adds about AUD 600. Send us your process data for an exact quote.
How often do wedge meters need recalibration? With clean fluids, every 24 months is typical. For abrasive slurries, we recommend annual inspection of the wedge face thickness. Our meters have a wear marker groove: when the groove disappears, replace the wedge element. That avoids unplanned downtime.
Can I use a wedge meter on non-Newtonian fluids? Yes, but you must provide rheology data. Shear-thinning fluids like polymer solutions need a stable shear rate. The wedge shape creates a near-constant shear profile, which helps. We have calibrated meters for xanthan gum and CMC solutions up to 10,000 cP.
What is the difference between a segmental wedge and a conical wedge? A segmental wedge is a flat plate with a V-notch, suitable for general slurry. A conical wedge has a 3D profile that reduces permanent pressure loss by about 15%. For long pipelines with limited pump head, the conical design pays for itself in energy savings.
How to Get a Wedge Flow Meter Quotation
Contact our application team at Silver Automation Instruments. Provide your fluid name, viscosity in cP, pipe diameter (DN), operating pressure (bar) and temperature (°C), and solids content if any. We will propose a wedge probe with material, seal type, and output protocol within one working day.
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